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Post by arappaho on May 7, 2009 22:15:44 GMT -5
Brazilian Agate is a pretty common, abundant material. Because of this it is also fairly cheap, or affordable. But, because it is so plentiful, there's no end to what you can do with it. These are all made from Brazilian agate. I still can't take a decent close-up, but thanks for looking.
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Post by saskrock on May 7, 2009 22:41:08 GMT -5
Really nice cabs arappaho. I really like the ones in the second picture.
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Post by amythestguy on May 9, 2009 0:02:54 GMT -5
WOW joe that is fantastis..those "rods" are very cool looking. I like what you did
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raqy
Senior Member
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Post by raqy on May 20, 2009 16:41:27 GMT -5
Those are all amazing. The would all make some great wraps..
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Post by writerman2255 on May 20, 2009 18:31:56 GMT -5
You know, I never thought I'd say this, but so many of our members do such a nice job cabbing agate, that I've come to really like it. I know it's not emerald, Arappaho, but those are nice!
Love and Light, Tom.
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Post by kap on May 20, 2009 18:39:17 GMT -5
Those are AWESOME! I love them all. Great job arappaho. Keith
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ken
Junior Member
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Post by ken on May 20, 2009 20:21:34 GMT -5
Joe, you did a great job on these. Love the banded agate, and the shapes. Ken
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Post by arappaho on May 20, 2009 22:00:56 GMT -5
Thanks y'all. I really like the way that banded stuff came out too. I love agate. It's so dang hard you can't go fast enough to mess up. Thanks, raqy. Good to hear from you! Joe
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Post by botanyme on May 21, 2009 10:37:23 GMT -5
sweet joe, I'll take two of the long skinny ones, with a hole at the top, for a pair of earrings. fabulous! b, thinking she wishes she could afford to get some equipment...
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Post by 4cornersrocks on May 21, 2009 10:54:13 GMT -5
Nice job!
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Post by sapphiregirl on May 29, 2009 12:24:32 GMT -5
The round one looks like a jellyfish, one looks like a tooth and then it looks like the Madona in stone and so I like them. They came out great.
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Post by Steve S. on Jun 2, 2009 21:06:23 GMT -5
Arappaho, About this agate: Do you see the wavy pattern in it, is there a name for that? I got a "pile" of agate slices from a friend that had "no use" for them, and about 1/3 of them had that funky patterning that only shows up when lit from behind. I kept it in the back of my mind, but haven't heard of a name for it... Any idea? Thanks, -Steve
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Post by william780 on Jun 3, 2009 6:23:28 GMT -5
Simply awesome!
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Post by arappaho on Jun 3, 2009 6:57:38 GMT -5
Good Morning to you Steve, No, I do not know what to call that "wavy" appearence in the agate. And, like you, I only see it in some agates. I have always related it to Carnelian, as I seem to see it more in Carnelian colored agate, but I have seen it in agates with no Carnelian color as well. Soooo, I don't know what to tell you. Thanks for all the comments folks! Sapphiregirl, I hope you are feeling much better these days. Becky, I had the same idea about the earrings. I think I have a little more of that particular agate, just need to find it. Joe
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Post by hydrogeologist on Jun 3, 2009 7:16:50 GMT -5
Did you purchase it as a slab or was it a nodule or vein material that you slabbed yourself?
I'm just thinking that the agate could have been botryoidal and the wavy lines are depositional layers created as the agate was formed. Just my two cents.
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Post by romare on Jun 3, 2009 10:52:43 GMT -5
Man, Joe. Those are purty! Especially the long cross-banded pieces.
Mark
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Post by arappaho on Jun 3, 2009 19:38:46 GMT -5
Thanks Mark. That may be it on those banded pieces because I can't seem to find anymore of it. But to answer your question, hydro, good thought but the agate wasn't boytroidal. It was pretty much like all your Brazilian agate rinds. Here's a couple of quick pics of some slabs with areas of the "wavy" pattern. I know I've seen some pieces with that pattern throughout but couldn't lay my hands on one. Steve might be able to post a better example of the "Wave", but if we really want to know what the 'name' for that effect is we'll have to ask Ken. He's got that new Agate and Jasper book and I bet the name for it's in there somewhere. ;D Joe
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Post by Steve S. on Jun 3, 2009 23:41:00 GMT -5
The ones I have are, were in slab already when I got them....
Yes, I thought boytroidal when I first saw them also, but it wouldn't explain how you can have wavy boytroidal laid down, but the "lines" or "rings" in the agate are not affected in any way by the boytroidal look... I would expect similar waves in the fortification rings, etc. of the agate. So I would also rule that out. I've gotta find mine and photo them for you.
The effect is really cool, and is more like a 'watermark" that you may see in Money or expensive paper. Looking right down, they are almost invisible, but when backlit, it jumps right out at you.
hopefully I'll post pics tomorrow... Gotta get sleep tonight.
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Post by Steve S. on Jun 3, 2009 23:47:07 GMT -5
Now I have to go and correct myself, because a closer look at the pictures and you CAN see a change in the fortification rings that seem to coorispond with the "watermark" especially in the "tube" that is coming out of the one in the last batch of pictures above that Arappaho posted. So maybe it formed and had boytrodial qualities but as more silica entered the pocket and it was still crystalizing, then it just continued like a normal agate, but where the "watermark" was seemed to be it just was filled in around it? Hmm... I like the term "watermark agate" (tm, 2009)
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Post by Steve S. on Jan 8, 2010 0:54:00 GMT -5
First, My apollogize for digging up an old thread, but I think I found the answere, and I knew I had asked the question. I doubt anyone really cares, but I figured I'd share the answere that I think is correct. (Sometimes things just stick in the back of my head for days/months/years and I just have to unload it.) So anyways, the "Wavy" effect looks like shadows in the rock. From what I'm seeing online, this is parallax effect. Do some googling for agate Parallax and you'll see some similar. I'm not a master of science or language, but thats what I'm gonna close this one as. Unless anyone has any better? "Parallax is an apparent displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines" From Wikipidia, the least trusted source on the internet! Don't ya'll fee smarter now? Hope everyone had a great Christmas and New Year! Hopefully 2010 will ROCK! Arappaho, About this agate: Do you see the wavy pattern in it, is there a name for that? I got a "pile" of agate slices from a friend that had "no use" for them, and about 1/3 of them had that funky patterning that only shows up when lit from behind. I kept it in the back of my mind, but haven't heard of a name for it... Any idea? Thanks, -Steve
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ken
Junior Member
Posts: 0
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Post by ken on Jan 9, 2010 8:27:04 GMT -5
Hey, I just found this thread. Don't know how I missed it. Steve, you are right. Boytroidal with parallel bands called parallax. Ken PS. Donna has about a 55 gal drum of uncut agates. I get tired of cutting it. Don't sell at the shows we do.
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Post by arappaho on Jan 9, 2010 9:19:32 GMT -5
Yeah, "parallax". That has a nice ring to it! Thanks, Steve, and congratulations on starting the New Year by taking care of one of the things on your "What's The Name of That Stuff" list. ;D Have a Good One! Joe
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Post by rayjeri on Jan 9, 2010 17:32:16 GMT -5
Joe That is what I call Iris agate.
Ray
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Post by arappaho on Jan 10, 2010 0:16:19 GMT -5
Seems I recall hearing that name used before too, Ray. So we have two names for the same effect. Going to have to start looking at that stuff closer, I just don't see the boytroidal cause for the effect. And, Ray, BTW, , really nice Sav. River agate you posted a pic of. Joe
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Post by agatesrule on Jan 10, 2010 2:29:07 GMT -5
The “wavy lines” in that agate are not iris or parallax. Back light an iris agate and it refracts light into a rainbow of colors, like a prism does. Parallax (also called shadow) is tougher to describe. When the agate is moved around, the light off the banded areas dances around, flipping back and forth, light to dark, dark to light. Parallax is seen with light off the face of the agate, not with back light, so it can show in thick, opaque slabs or half nodules. Iris is a see-through effect, parallax is not. Chatoyance in tiger eye is not parallax, but they're vaguely similar.
I don’t think there is a name for those wavy lines, but I like Hydrogeologist’s idea of depositional layers. Or maybe boundaries where the grain changes direction.
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Post by agatesrule on Jan 13, 2010 2:15:12 GMT -5
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Post by Steve S. on Jan 14, 2010 11:17:40 GMT -5
I agree with agatesrule about the iris agates. I've seen a piece of that before, and it was like a fracture that you get in glass that has a rainbow effect. Some speculation was put forth in an older issue of lapidary journal that it may have been the original "opal" mentioned in the bible because the greek translation and modern idea of opal do not match up completely. (If I recall my reading, but it may have been beer induced.) As for parallax not being correct either, shucks, now I've gotta start over... I understand how it is created, I can see the botryoidal effect, but there should be a NAME for it. Not all agate slices show that when held up. I only had about 5% of the slices I got in a pile from an estate that did that. (None that I've ever cut, so it may be source related also.) I WANT to know the techincal term for that effect so that I can properly label, etc. botryoidal with parallel bands is a description not a name. I know the tall green stuff that grows in my back yard is a plant, but I call it grass so that people don't laugh when I give a made up name of greenstrings. ;D So, anyone else? otherwise I'll keep it in the nogin for a mystery name that needs found. Oh, I just found one reference to "turtle-backing" but again, not a technical term... Botryoidal is the forming of the bumps in the agate etc... but the question I have is what is the term for those bumps as they translate when the piece is cut and polished?
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Post by arappaho on Jan 14, 2010 19:59:17 GMT -5
Well, I couldn't get into the link for the Iris agate, but those are some great examples for the parallax effect, agatesruler. And I know where you're coming from, Steve. It's gotta have a NAME! So how about "diffraction grating", or a very unusual form of quartz crystal growth. Got those ideas from this article; www.minsocam.org/MSA/collectors_corner/arc/iris.htmJoe
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Post by agatesrule on Jan 14, 2010 20:56:58 GMT -5
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Post by rayjeri on Jan 15, 2010 8:52:51 GMT -5
In my experence the only to get the rainbow effect in iris agate is to slice the agate very thin, say 1/8 inch. Ray
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